Influences of Extractable Soil Water and Vapor Pressure Deficit on Transpiration and Staomatal Resistance in Differentially Irrigated Wheat

Japanese Journal of Crop Science

Yoshio INOUE¹  Paul J. Jr. PINTER¹  Robert J. REGINATO¹  Ray D. JACKSON¹ 

关键词: Drought stress;    灌漑;    Irrigation;    乾燥ストレス;    Remove sensing;    気孔抵抗;    Stomatal resistance;    コムギ;    transpiration;    蒸散速度;    Vapor pressure;    大気飽差;    dificit;    リモートセンシング;    wheat;   

DOI  :  10.1626/jcs.58.430

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The response of transpiration (Tr) and stomatal resistanse (rs) to extractable soil water and the vapor pressure dificit of the air was investigated over three differentially irrigated wheat plots for an entire growing season. The objective was to devolop a physiological basis for remote monitoring of crop and soil water status. The results indicated that Tr was closely correlated with the extractable soil water (ESW) remaining in the soil when the ESW was less than 40%. When the ESW was greater than 40%, Tr was propotional to the vapor pressure deficit of the air (VPDa). Stomatal resistance (rs) was found to increase hyperbolically with decreasing ESW (r=0.82), although rs was small and independent of ESW at high ESW. No relationship was found between rs and VPDa. The correlation between the ratio Tr/VPDa and ESW was higher (r=0.75) than the correlation between Tr and ESW. Normalizing Tr and ESW values for the water stressed plots to those observed in the well watered plot improved this correlation to r=0.91. Multiple regression analysis showed that rs1 and VPDa were highly correlated with ESW (r=0.92-0.97).

【 授权许可】

Unknown